phillipsite (cas 12174-18-4) formation in nephelinitic rocks in response to hydrothermal alteration at Mount Etinde, Cameroon

Add time:08/04/2019    Source:sciencedirect.com

Fresh nephelinitic rocks and hydrothermally altered rocks at Mount Etinde (Cameroon Volcanic Line, West Africa) have been studied by combined whole rock geochemistry (ICP-MS), mineralogy and mineral chemistry (SEM-EDS, WDS, XRD) techniques. The nephelinites have feldspathoids, clinopyroxene, perovskite and titanomagnetite as the principal minerals in the mode with subsidiary apatite and sphene. The mineralogy of their hydrothermally altered counterparts includes phillipsite (cas 12174-18-4), calcite and analcime which are secondary phases developed in response to hydrothermal fluid events. Correspondingly, the bulk rock geochemical data show elevated SiO2, CaO, Na2O and K2O concentrations with increasing alteration and Al2O3 and Fe2O3 depletion while MgO, MnO and TiO2 concentrations are largely unaffected. The nephelinites also have high concentrations of LILLE, HFSE and REE and upon hydrothermal alteration they show an enrichment of LREE and MREE over HREE. Phillipsite is the principal alteration mineral in the rocks and it occurs along cracks, vesicles and also forms alteromorphs after feldspathoids. The Ce content of these categories of phillipsite varies. Phillipsite along cracks is richer in Ce while phillipsite associated with calcite has lower Ce concentration and the phillipsite alteromorphs very little or no Ce. Various stages of fluid circulation are proposed hereby to explain the variations in phillipsite generation and composition.

We also recommend Trading Suppliers and Manufacturers of phillipsite (cas 12174-18-4). Pls Click Website Link as below: cas 12174-18-4 suppliers

Prev:Adsorption of the mycotoxin zearalenone by clinoptilolite and phillipsite (cas 12174-18-4) zeolites treated with cetylpyridinium surfactant
Next:Asymmetric Ferromagnetic Criticality in pyrochlore (cas 12174-36-6) Ferromagnet Lu2V2O)